meter. When medical X-rays are being produced, a thin metallic sheet is placed between the emitter and the target, effectively filtering out the lower energy (soft) X-rays. The resultant X-ray is said to be
. The frequency of hard X-rays is higher than that of soft X-rays, and the wavelength is shorter. Hard X-rays overlap the range of "long"-wavelength (lower energy)
, however the distinction between the two terms depends on the source of the radiation, not its wavelength: X-ray
.
X-ray K-series spectral line wavelengths (nm) for some common target materials
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